/Engine/Source/Runtime/Engine/Public/Net/OnlineEngineInterface.h
a properFUniqueNetIdpointer generated by the default OnlineSubsystem
virtual [FUniqueNetIdWrapper](API\Runtime\CoreOnline\Online\FUniqueNetIdWrapper) CreateUniquePlayerIdWrapper ( const [FString](API\Runtime\Core\Containers\FString) & Str, [FName](API\Runtime\Core\UObject\FName) Type )